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Onisis Consulting

Athens, Greece · Business Services

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ONISIS Consulting is a boutique financial-management advisory firm helping growing small and medium enterprises (€3M–€50M turnover) identify where money is lost, where capital is trapped, and which strategic decisions to make first.We envision a generation of resilient enterprises: businesses that lead their sectors, stand on solid liquidity, and build lasting value that endures over time.

Overview

ONISIS Consulting is a boutique financial-management advisory firm helping growing small and medium enterprises (€3M–€50M turnover) identify where money is lost, where capital is trapped, and which strategic decisions to make first.


We envision a generation of resilient enterprises: businesses that lead their sectors, stand on solid liquidity, and build lasting value that endures over time. Our mission is to unlock trapped value inside them, giving business owners the momentum and confidence to scale sustainably and stay competitive.


Founded by Konstantinos Kormentzas, a former banking C-level executive (CRO/Auditor/COO), ONISIS acts as an objective, un-fogged "second brain" for business owners. We combine executive-level banking rigor with agile operational execution, replacing generic advice with clear, empirical numbers.


Our Core Service Offerings:


• Fractional CFO Advisory: Senior-level financial governance, board-level sparring, and ongoing financial oversight without the overhead of a permanent C-suite hire.

• Cash Flow & Working Capital Optimization: Releasing trapped liquidity in receivables and slow-moving inventory to self-fund expansion and eliminate unnecessary debt.

• Profitability Enhancement: Granular customer- and SKU-level margin analysis to stop profit leakage from unmeasured discounts and legacy trading terms.

• Business Intelligence (Power BI): Custom executive reporting architectures that establish a Single Source of Truth (SSOT) across operations for five-minute decisions.

• Strategic Financial Planning & Financing: Bank-grade business plans, scenario forecasting, and debt restructuring advisory to secure financing on optimal terms.

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Contact Details

+302103001803
contact@onisisconsulting.gr

Athens, Greece

Founder

Mr Konstantinos Kormentzas

Founded

2020

Company Type

Private Limited Company

Employees

2-10

Categories

Management Consulting
Financial Consulting
Business Intelligence
Strategic Planning
Professional Advisory

Keywords

#Financial Management Consulting

#Fractional CFO

#Cash Flow Optimization

#Working Capital Management

#Profitability Enhancement

#Business Intelligence

#Strategic Financial Planning

#Business Plan

#SME Financial Advisory

#Funding Strategy

Awards

• 2026 OpenSee all

Services

financial-planning-hero.jpg
Strategic Financial Planning, Business Plans & Financing Advisory
Business Consulting

Preparing a major capital investment, facility expansion, acquisition, or bank financing? Before you commit capital, unexamined assumptions are always the ones that cost the most. We stress-test operational scenarios, build dynamic bank-grade financial models, and structure capital options so you move with complete confidence.Led by former banking C-level executive Konstantinos Kormentzas (CRO/Auditor/COO with 20+ years of institutional banking experience), our Financial Planning service delivers: • Bank-Grade Business Plans: Institutional-caliber financial plans and multi-year projection models designed to answer the exact risk and covenant questions credit committees ask. • Dynamic Scenario & Sensitivity Stress-Testing: Evaluating best, base, and downside cash scenarios against inflation, cost overruns, and delayed sales ramp-up. • Capital Structure & Funding Optimization: Comparing bank debt, equity, working capital facilities, and mezzanine options to minimize cost of capital and dilution. • Banking Negotiation Support: Leveling the playing field when negotiating loan covenants, interest spreads, and collateral terms.

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